If something is not profitable enough, then that is still a form of charity. For example, suppose that my market rate is $50/hour. An organization tells me that they could really use my services, but all they can afford to pay me is $10/hour. If I accept their offer, then I am essentially giving them the equivalent of $40/hour in charity.
Anyway, let's assume that you're correct and you can earn a nice 10% return by taking a moderate risk. Why not start this company yourself? The private sector is open to everyone. If people want your service badly enough, and they trust you to provide that service, then you should be able to raise the money.
Even if you like to pay taxes, would you be willing to acknowledge that taxes are, at best, a necessary evil, and the use of coercion should be minimized? As an analogy, suppose that you have a police officer who is legally justified in killing a threatening man, but this police officer believes he can safely de-escalate the situation. Would you like the officer to minimize his use of force? If so, then you should also wish to keep the use of taxation to a minimum.